Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 126
Fir.. 56.—Eefleitiiif? Tt_-le.sc(ppe (Casscgraiii). where an image is formed ready to be viewed by theeyepiece e. It appears from this, that the convex mirroris in this case acting somewhat in the same manner asthe concave lens does in the Galilean telescope. … Front View Telescope (Hersche]) Then, lastly, we have the suggestion which Sir WilliamHerschel soon turned into more than a suggestion. Themirror m in this arrangement is placed at the bottom ofthe tube as in the other forms, but, instead of beingplaced flat on the bottom it is slightly tipped, so…
Astronomy · Telescopes
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